github.com/hikaru7719/go@v0.0.0-20181025140707-c8b2ac68906a/test/fixedbugs/issue4085b.go (about)

     1  // run
     2  
     3  // Copyright 2013 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package main
     8  
     9  import (
    10  	"strings"
    11  	"unsafe"
    12  )
    13  
    14  type T []int
    15  
    16  func main() {
    17  	n := -1
    18  	shouldPanic("len out of range", func() { _ = make(T, n) })
    19  	shouldPanic("cap out of range", func() { _ = make(T, 0, n) })
    20  	shouldPanic("len out of range", func() { _ = make(T, int64(n)) })
    21  	shouldPanic("cap out of range", func() { _ = make(T, 0, int64(n)) })
    22  	var t *byte
    23  	if unsafe.Sizeof(t) == 8 {
    24  		var n2 int64 = 1 << 50
    25  		shouldPanic("len out of range", func() { _ = make(T, int(n2)) })
    26  		shouldPanic("cap out of range", func() { _ = make(T, 0, int(n2)) })
    27  		n2 = 1<<63 - 1
    28  		shouldPanic("len out of range", func() { _ = make(T, int(n2)) })
    29  		shouldPanic("cap out of range", func() { _ = make(T, 0, int(n2)) })
    30  	} else {
    31  		n = 1<<31 - 1
    32  		shouldPanic("len out of range", func() { _ = make(T, n) })
    33  		shouldPanic("cap out of range", func() { _ = make(T, 0, n) })
    34  		shouldPanic("len out of range", func() { _ = make(T, int64(n)) })
    35  		shouldPanic("cap out of range", func() { _ = make(T, 0, int64(n)) })
    36  	}
    37  
    38  	// Test make in append panics since the gc compiler optimizes makes in appends.
    39  	shouldPanic("len out of range", func() { _ = append(T{}, make(T, n)...) })
    40  	shouldPanic("cap out of range", func() { _ = append(T{}, make(T, 0, n)...) })
    41  	shouldPanic("len out of range", func() { _ = append(T{}, make(T, int64(n))...) })
    42  	shouldPanic("cap out of range", func() { _ = append(T{}, make(T, 0, int64(n))...) })
    43  }
    44  
    45  func shouldPanic(str string, f func()) {
    46  	defer func() {
    47  		err := recover()
    48  		if err == nil {
    49  			panic("did not panic")
    50  		}
    51  		s := err.(error).Error()
    52  		if !strings.Contains(s, str) {
    53  			panic("got panic " + s + ", want " + str)
    54  		}
    55  	}()
    56  
    57  	f()
    58  }